Constitution, as the attribute that represents one's hardiness, ought to have an influence on the speed at which one recovers from wounds. Therefore, any bonus derived from one's constitution shall be added to one's normal daily rate of hit point recovery, which in the case of Basic/Expert D&D and Labyrinth Lord is 1d3 hit points per day of rest. Penalties for low constitution do not apply under normal circumstances. If, however, any of the wounds were caused by the undead, then the penalties are applied as follows: -1 penalty = 1 hit point per day of rest; -2 penalty = 1 hit point for every two days of rest; -3 penalty = 1 hit point for every three days of rest. The frail and sickly are especially vulnerable to attacks by the undead and correspondingly take longer to recover from an encounter with such.